19:10fool . . . luxury. A fool cannot handle the responsibility of riches. Possibly the verse refers to a fool in a position of administrative power rather than of wealth.

a slave to rule over princes. The situation is unfitting, not so much because the oppressed become the new oppressors, but because it is incongruous for those not socially and intellectually prepared to govern society. But compare 2 Sam. 7:8 for the exception.